add @rooterkyberian to AUTHORS file

rooterkyberian · rooterkyberian · commit 909de0354e85 · 2017-05-20T23:07:17.000+02:00
diff --git a/AUTHORS.rst b/AUTHORS.rst
@@ -21,6 +21,7 @@ Authors
 - Jonathan Sanchez
 - Josh Fyne
 - Klaas van Schelven
+- Maciej "RooTer" Urbański
 - Martin Bachwerk
 - Marty Alchin
 - Mauricio de Abreu Antunes
